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-rw-r--r--arch/x86_64/mm/Makefile2
-rw-r--r--arch/x86_64/mm/mmap.c30
2 files changed, 31 insertions, 1 deletions
diff --git a/arch/x86_64/mm/Makefile b/arch/x86_64/mm/Makefile
index 1d232a87f113..d25ac86fe27a 100644
--- a/arch/x86_64/mm/Makefile
+++ b/arch/x86_64/mm/Makefile
@@ -2,7 +2,7 @@
2# Makefile for the linux x86_64-specific parts of the memory manager. 2# Makefile for the linux x86_64-specific parts of the memory manager.
3# 3#
4 4
5obj-y := init.o fault.o ioremap.o extable.o pageattr.o 5obj-y := init.o fault.o ioremap.o extable.o pageattr.o mmap.o
6obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o 6obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
7obj-$(CONFIG_NUMA) += numa.o 7obj-$(CONFIG_NUMA) += numa.o
8obj-$(CONFIG_K8_NUMA) += k8topology.o 8obj-$(CONFIG_K8_NUMA) += k8topology.o
diff --git a/arch/x86_64/mm/mmap.c b/arch/x86_64/mm/mmap.c
new file mode 100644
index 000000000000..43e9b99bdf25
--- /dev/null
+++ b/arch/x86_64/mm/mmap.c
@@ -0,0 +1,30 @@
1/* Copyright 2005 Andi Kleen, SuSE Labs.
2 * Licensed under GPL, v.2
3 */
4#include <linux/config.h>
5#include <linux/mm.h>
6#include <linux/sched.h>
7#include <linux/random.h>
8#include <asm/ia32.h>
9
10/* Notebook: move the mmap code from sys_x86_64.c over here. */
11
12void arch_pick_mmap_layout(struct mm_struct *mm)
13{
14#ifdef CONFIG_IA32_EMULATION
15 if (current_thread_info()->flags & _TIF_IA32)
16 return ia32_pick_mmap_layout(mm);
17#endif
18 mm->mmap_base = TASK_UNMAPPED_BASE;
19 if (current->flags & PF_RANDOMIZE) {
20 /* Add 28bit randomness which is about 40bits of address space
21 because mmap base has to be page aligned.
22 or ~1/128 of the total user VM
23 (total user address space is 47bits) */
24 unsigned rnd = get_random_int() & 0xfffffff;
25 mm->mmap_base += ((unsigned long)rnd) << PAGE_SHIFT;
26 }
27 mm->get_unmapped_area = arch_get_unmapped_area;
28 mm->unmap_area = arch_unmap_area;
29}
30